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By the way I tested this and it does not work!  I set the path monitoring to ping the gateway of the management interface's network and failed my management interface.  The device did not fail over but it did crash!

So I logged a support ticket and the answer came back that it would have used any available path for the path monitoring.  Unfortunately because it stayed active, my AD lookups stacked up and the useridd process crashed, the firewall wouldn't respond on the console and the only way out was to power it off.

So if you set the box up using the DEFAULT, to use the management port for service routes and your management port goes down...

1. It can't be made to fail over
2. It can no longer resolve any users
3. It can't update
4. It can't be managed
5. You can't get on via the console
6. and it crashes key processes

Why has no-one else realised that a failure of the management port is the achilles heel of the HA?